LR 5 Freezes on MacOS OS 10.9 Mavericks

A number of my user friends are using LR 5.4 either the CC version or the Disc version, on Macbook Pros and on Mac Pros, with OSX 9 Mavericks. LR continues to exhibit a variety of problems such as freezes of mouse failing to respond that require restart of LR. In one case yesterday, the sliders in the develop module did not show background colors - only all white, and the spot healing tool would not show the circle defining either the target or source area. In that case the computer had to be rebooted to restore function.

I have been an LR user since version 1.0 and used V 3 and V4 on the same Mac Pro with OS X10.7 and 10.8 without any of these problems.